CN105964197B - A kind of microcapsule phase-change fluid and preparation method thereof suitable for building heat supplying system - Google Patents
A kind of microcapsule phase-change fluid and preparation method thereof suitable for building heat supplying system Download PDFInfo
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- CN105964197B CN105964197B CN201610515293.6A CN201610515293A CN105964197B CN 105964197 B CN105964197 B CN 105964197B CN 201610515293 A CN201610515293 A CN 201610515293A CN 105964197 B CN105964197 B CN 105964197B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/06—Making microcapsules or microballoons by phase separation
- B01J13/14—Polymerisation; cross-linking
- B01J13/18—In situ polymerisation with all reactants being present in the same phase
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/001—Central heating systems using heat accumulated in storage masses district heating system
Abstract
The present invention relates to composite sciences and new energy source technology field, specially a kind of microcapsule phase-change fluid and preparation method thereof suitable for building heat supplying system, solving current material, that there are amount of stored heat is low, fluid heat transferring coefficient is little, surfusion is prominent, the problem of lamination is seriously not used to building heat supplying system, by Pickering lotion, phase-change microcapsule, multi-walled carbon nanotube, drag reducer and water are made, step is preparation Pickering lotion, multi-walled carbon nanotube is pre-processed, the synthesis and the synthesis of microcapsule phase-change fluid of phase-change microcapsule are completed in Pickering lotion using the method for in-situ polymerization, such phase change fluid phase transition temperature is at 60 DEG C or so, amount of stored heat reaches 180J/g, heat transfer coefficient is 2 ~ 3 times of usual phase change fluid, and degree of supercooling Less than 1.0 DEG C, hydrodynamic performance is stablized, and not stratified, not broken capsule, it is a kind of ideal phase change fluid being used suitable for building heat supplying system that these material properties, which have fully met the requirement as building heat supplying system fluid,.
Description
Technical field
The present invention relates to composite sciences and new energy source technology field, specially a kind of to be suitable for building heat supplying system
Microcapsule phase-change fluid and preparation method thereof.
Background technique
Phase-change material (PCM, phase change material) is undergone phase transition in specific temperature section, passes through phase transformation
It absorbs or release heat, realization heat-accumulation temperature-adjustment acts on, the temperature of adjustment, control operation source or surrounding materials environment.Higher alkane,
The solid-liquid phase change materials such as higher alcohol, higher acid, advanced ester are easy flowing in phase transition process, and easily mix with ambient substance
It is mixed, it is restricted in practical applications, microencapsulation is to solve the problems, such as one of this effective ways.
Phase-change microcapsule material is in phase transition process, and solid-liquid phase transition occurs for the phase-change material as kernel, outer layer
Polymeric membrane remains solid-state, therefore such phase-change material macroscopically will be solid particle always, with traditional phase transformation material
Material is compared, and improves stability to a certain extent, enhances heat transfer property, improves processability.The microcapsules studied at present
The generally existing many shortcoming and defect of phase-change material, it is low to be mainly manifested in microcapsules amount of stored heat, fluid heat transferring coefficient less, supercooling
Phenomenon is prominent, lamination is serious, and impact resistance is inadequate when fluid flows in pipeline, microcapsules cracky etc., so that phase
The application field of change energy-storage material is somewhat limited.
Up to the present, it there are no and microencapsulated phase change material be applied to building heat supplying systematic account.
Summary of the invention
The present invention there are amount of stored heat in order to solve existing microencapsulated phase change material low, fluid heat transferring coefficient less, supercooling it is existing
As protrusion, lamination is serious and the problem of be not used to building heat supplying system, provide a kind of suitable for building heat supplying system
Microcapsule phase-change fluid and preparation method thereof.
The present invention is achieved by the following technical scheme: a kind of microcapsule phase-change stream suitable for building heat supplying system
Body is made of the raw material of following weight percents: Pickering lotion 30 ~ 35%, phase-change microcapsule 8 ~ 10%, multi-wall carbon nano-tube
Pipe 0.8 ~ 1.0%, drag reducer 0.05 ~ 0.10%, remaining be water.
A kind of preparation method of the microcapsule phase-change fluid suitable for building heat supplying system, comprising the following steps:
(1) Pickering lotion is prepared: by hydrophilic and oleophilic type Nano-meter SiO_22Particle disperses in deionized water, Cheng Shuixiang；
Ethyl acetate is poured at oily phase in same amount of polyoxypropyleneglycol, after then grease mixes, then plus emulsifier, stir
It mixes to get Pickering lotion is arrived；(2) multi-walled carbon nanotube is pre-processed: using ultrasonic oscillation mode and Fenton
The method of reagent modification, obtains hydroxylated CNTs, and high-speed shearing machine is recycled to carry out emulsification shearing, and finally plus coupling agent carries out
Grafting processing, obtains the CNTs for connecting coupling agent；(3) phase transformation is completed in Pickering lotion using the method for in-situ polymerization
The synthesis of microcapsules: in Pickering lotion, adding palmitinic acid to make core material, adds melamine resin to make wall material, then plus by being modified
Nano-meter SiO_22, assembled and formed cladding after reaction around core material, obtain the phase-change microcapsule being made of capsule-core and cyst wall；
(4) synthesis of microcapsule phase-change fluid: in ickering lotion, sequentially add phase-change microcapsule obtained in abovementioned steps,
Multi-walled carbon nanotube and water, drag reducer stir evenly to get microcapsule phase-change fluid of the present invention.
In above-mentioned steps, the preparation method of Pickering lotion: by hydrophilic and oleophilic type Nano-meter SiO_22Particle 1.0g is dispersed in
In deionized water, Cheng Shuixiang；5 ml ethyl acetate are poured into same amount of polyoxypropyleneglycol into oily phase, then grease phase
After mixing, then plus emulsifier Ben-zylphenol Polyoxyethyl Ether 1ml, stir 50min to get arrive stable Pickering lotion.
Multi-walled carbon nanotube carries out pretreated method: ultrasonic oscillation mode is used, the aggregate structure of CNTs is orderly
Change, then using the method for Fenton reagent modification, react 5 h at room temperature, filter, after water washing to neutrality, is placed in 100
Dry 2h, obtains hydroxylated CNTs at a temperature of DEG C, recycles high-speed shearing machine to carry out emulsification shearing, makes hydroxylated CNTs long
Degree is 10 ~ 30nm, and finally plus coupling agent carries out grafting processing, obtains the CNTs for connecting coupling agent.
The synthesis of phase-change microcapsule is completed in Pickering lotion using the method for in-situ polymerization: filling 200ml
In the beaker of Pickering lotion, palmitinic acid 30.0g is added to make core material, adds melamine tree in the ratio of core material and wall material quality 5: 1
Rouge 6.0g makees wall material, and with heating water bath to 40 DEG C, adjusting solution pH value is 7.0, is stirred to react 40min, then plus modified
Nano-meter SiO_22After 2.0g, the reaction was continued 30min, and 10% acetic acid is added dropwise and adjusts acid until the pH value of solution is 5. 0, at this time
Dissolved adhesiveness gradually increases, and becomes opaque, is assembled and is formed cladding around core material, obtain phase-change microcapsule.
The synthesis of microcapsule phase-change solution: after standing, the Pickering lotion of 150 ~ 165ml is added into beaker, adds
40 ~ 50g of phase-change microcapsule, by pretreated 4.0 ~ 5.0g of multi-walled carbon nanotube, then plus 280 ~ 300ml water, be in temperature
30 ~ 45min is quickly stirred at 40 ~ 50 DEG C, 0.25 ~ 0.50 g of addition polymerization ethylene oxide ether is stirred evenly as drag reducer to get this
The invention microcapsule phase-change fluid.
When multi-walled carbon nanotube is pre-processed, grafting processing method be by silane coupling agent methyltrimethoxysilane with
CNTs is mixed with the ratio that weight ratio is 2: 1, then at 60 DEG C 2 ~ 4h of isothermal reaction to get to connecting coupling agent
CNTs。
In above-mentioned formula, Pickering lotion is a kind of by the stable cream of the traditional organic surface active agent of solids replacement
The New Emulsion of liquid system, compared with conventional emulsion, Pickering lotion have strong interface stability, reduce foam occur, can
The advantages such as regeneration, low toxicity, low cost, the present invention be added Pickering lotion effect be guarantee phase change fluid stablize regardless of
Layer improves impact resistant strength；It combines with Fenton reagent method of modifying in the way of modified ultrasonic oscillation and carries out cream
Change shearing and grafting processing, multi-walled carbon nanotube is modified, effect is the heat transfer property for improving phase change fluid, reinforced phase
The stability and resistance to foreign impacts for becoming solution, reduce its superfusibility；Add palmitinic acid to make core material, melamine resin is added to make wall material, adopts
With the obtained microcapsules of situ aggregation method, compressive resistance is high, and core material covered effect is good, in order to both guarantee phase-change thermal storage microcapsules
Heat accumulation effect, and guarantee the compactness of microcapsules, the preferred core material of the present invention and wall material mass ratio are 5: 1.
The present invention (is one kind so that colloidal particle replaces organic surface active agent and is formed using Pickering lotion by base fluid
Aqueous emulsion, moisture content be more than 85%), multi-walled carbon nanotube be thermally conductive additive, using the higher palmitinic acid of phase transition temperature as core
Material, melamine resin are phase change fluid made of the microencapsulated phase change material set that wall material is prepared.The phase of such phase change fluid
Temperature is at 60 DEG C or so, and amount of stored heat reaches 180J/g, and heat transfer coefficient is 2 ~ 3 times of usual phase change fluid, and degree of supercooling is less than
1.0 DEG C, hydrodynamic performance is stablized, and not stratified, not broken capsule, these material properties have been fully met as building heat supplying system stream
The requirement of body is a kind of ideal phase change fluid being used suitable for building heat supplying system.
Detailed description of the invention
Fig. 1 is the surface of microcapsule form stereoscan photograph for amplifying 2000 times；
Fig. 2 is the surface of microcapsule form stereoscan photograph for amplifying 5000 times；
Fig. 3 is the schematic diagram of internal structure of microcapsules；
In figure: 1- cyst wall；2- capsule-core.
Specific embodiment
Embodiment 1:
A kind of microcapsule phase-change fluid suitable for building heat supplying system, is made of the raw material of following weight percents:
Pickering lotion 30%, phase-change microcapsule 10%, multi-walled carbon nanotube 0.8%, drag reducer 0.05%, remaining be water, it is specific to prepare
Method is as follows:
(1) Pickering lotion is prepared: by hydrophilic and oleophilic type Nano-meter SiO_22Particle 1.0g disperse in deionized water, at
Water phase；5 ml ethyl acetate are poured at oily phase in same amount of polyoxypropyleneglycol, after then grease mixes, then plus cream
Agent Ben-zylphenol Polyoxyethyl Ether 1ml stirs 50min to get stable Pickering lotion is arrived；
(2) multi-walled carbon nanotube is pre-processed: ultrasonic oscillation mode is used, by the aggregate structure ordering of CNTs,
Then using the method for Fenton reagent modification, 5 h are reacted at room temperature, are filtered, and after water washing to neutrality, are placed in 100 DEG C of temperature
The lower dry 2h of degree, obtains hydroxylated CNTs, recycles high-speed shearing machine to carry out emulsification shearing, make hydroxylated CNTs length
10 ~ 30nm, finally plus coupling agent carries out grafting processing, and specific method is by silane coupling agent methyltrimethoxysilane and CNTs
Mixed with the ratio that weight ratio is 2: 1, then at 60 DEG C isothermal reaction 2h to get to the CNTs for connecting coupling agent；
(3) synthesis of phase-change microcapsule is completed in Pickering lotion using the method for in-situ polymerization: being filled
In the beaker of 200ml Pickering lotion, palmitinic acid 30.0g is added to make core material, added in the ratio of core material and wall material quality 5: 1
Melamine resin 6.0g makees wall material, and with heating water bath to 40 DEG C, adjusting solution pH value is 7.0, is stirred to react 40min, then plus pass through
Modified Nano-meter SiO_22After 2.0g, the reaction was continued 30min, and 10% acetic acid is added dropwise and adjusts acid until the pH value of solution is 5.
0, dissolved adhesiveness gradually increases at this time, becomes opaque, is assembled and is formed cladding around core material, obtain by capsule-core and cyst wall structure
At phase-change microcapsule；
(4) synthesis of microcapsule phase-change fluid: after standing, the Pickering lotion of 150ml is added into beaker, adds
Phase-change microcapsule 40g, by pretreated multi-walled carbon nanotube 5.0g, then plus 300ml water, temperature be 40 DEG C when quickly stir
30min is mixed, 0.25 g of addition polymerization ethylene oxide ether is stirred evenly as drag reducer to get microcapsule phase-change stream of the present invention
Body.
Embodiment 2:
A kind of microcapsule phase-change fluid suitable for building heat supplying system, is made of the raw material of following weight percents:
Pickering lotion 35%, phase-change microcapsule 8%, multi-walled carbon nanotube 1.0%, drag reducer 0.1%, remaining be water, specific preparation side
Method is as follows:
(1) Pickering lotion is prepared: by hydrophilic and oleophilic type Nano-meter SiO_22Particle 1.0g disperse in deionized water, at
Water phase；5 ml ethyl acetate are poured at oily phase in same amount of polyoxypropyleneglycol, after then grease mixes, then plus cream
Agent Ben-zylphenol Polyoxyethyl Ether 1ml stirs 50min to get stable Pickering lotion is arrived；
(2) multi-walled carbon nanotube is pre-processed: ultrasonic oscillation mode is used, by the aggregate structure ordering of CNTs,
Then using the method for Fenton reagent modification, 5 h are reacted at room temperature, are filtered, and after water washing to neutrality, are placed in 100 DEG C of temperature
The lower dry 2h of degree, obtains hydroxylated CNTs, recycles high-speed shearing machine to carry out emulsification shearing, make hydroxylated CNTs length
10 ~ 30nm, finally plus coupling agent carries out grafting processing, and specific method is by silane coupling agent methyltrimethoxysilane and CNTs
Mixed with the ratio that weight ratio is 2: 1, then at 60 DEG C isothermal reaction 2h to get to the CNTs for connecting coupling agent；
(3) synthesis of phase-change microcapsule is completed in Pickering lotion using the method for in-situ polymerization: being filled
In the beaker of 200ml Pickering lotion, palmitinic acid 30.0g is added to make core material, added in the ratio of core material and wall material quality 5: 1
Melamine resin 6.0g makees wall material, and with heating water bath to 40 DEG C, adjusting solution pH value is 7.0, is stirred to react 40min, then plus pass through
Modified Nano-meter SiO_22After 2.0g, the reaction was continued 30min, and 10% acetic acid is added dropwise and adjusts acid until the pH value of solution is 5.0,
Dissolved adhesiveness gradually increases at this time, becomes opaque, is assembled and is formed cladding around core material, obtain being made of capsule-core and cyst wall
Phase-change microcapsule；
(4) synthesis of microcapsule phase-change fluid: after standing, the Pickering lotion of 165ml is added into beaker, adds
Phase-change microcapsule 50g, by pretreated multi-walled carbon nanotube 3.0g, then plus 280ml water, temperature be 50 DEG C when quickly stir
45min is mixed, 0.50 g of addition polymerization ethylene oxide ether is stirred evenly as drag reducer to get microcapsule phase-change stream of the present invention
Body.
Embodiment 3:
A kind of microcapsule phase-change fluid suitable for building heat supplying system, is made of the raw material of following weight percents:
Pickering lotion 32%, phase-change microcapsule 9%, multi-walled carbon nanotube 0.9%, drag reducer 0.08%, remaining be water, it is specific to prepare
Method is as follows:
(1) Pickering lotion is prepared: by hydrophilic and oleophilic type Nano-meter SiO_22Particle 1.0g disperse in deionized water, at
Water phase；5 ml ethyl acetate are poured at oily phase in same amount of polyoxypropyleneglycol, after then grease mixes, then plus cream
Agent Ben-zylphenol Polyoxyethyl Ether 1ml stirs 50min to get stable Pickering lotion is arrived；
(2) multi-walled carbon nanotube is pre-processed: ultrasonic oscillation mode is used, by the aggregate structure ordering of CNTs,
Then using the method for Fenton reagent modification, 5 h are reacted at room temperature, are filtered, and after water washing to neutrality, are placed in 100 DEG C of temperature
The lower dry 2h of degree, obtains hydroxylated CNTs, recycles high-speed shearing machine to carry out emulsification shearing, make hydroxylated CNTs length
10 ~ 30nm, finally plus coupling agent carries out grafting processing, and specific method is by silane coupling agent methyltrimethoxysilane and CNTs
Mixed with the ratio that weight ratio is 2: 1, then at 60 DEG C isothermal reaction 2h to get to the CNTs for connecting coupling agent；
(3) synthesis of phase-change microcapsule is completed in Pickering lotion using the method for in-situ polymerization: being filled
In the beaker of 200ml Pickering lotion, palmitinic acid 30.0g is added to make core material, added in the ratio of core material and wall material quality 5: 1
Melamine resin 6.0g makees wall material, and with heating water bath to 40 DEG C, adjusting solution pH value is 7.0, is stirred to react 40min, then plus pass through
Modified Nano-meter SiO_22After 2.0g, the reaction was continued 30min, and 10% acetic acid is added dropwise and adjusts acid until the pH value of solution is 5.0,
Dissolved adhesiveness gradually increases at this time, becomes opaque, is assembled and is formed cladding around core material, obtain being made of capsule-core and cyst wall
Phase-change microcapsule；
(4) synthesis of microcapsule phase-change fluid: after standing, the Pickering lotion of 160ml is added into beaker, adds
Phase-change microcapsule 45g, by pretreated multi-walled carbon nanotube 4.0g, then plus 290ml water, temperature be 45 DEG C when quickly stir
40min is mixed, 0.30 g of addition polymerization ethylene oxide ether is stirred evenly as drag reducer to get microcapsule phase-change stream of the present invention
Body.
Embodiment 4:
A kind of microcapsule phase-change fluid suitable for building heat supplying system, is made of the raw material of following weight percents:
Pickering lotion 34%, phase-change microcapsule 10%, multi-walled carbon nanotube 0.8%, drag reducer 0.06%, remaining be water, it is specific to prepare
Method is as follows:
(1) Pickering lotion is prepared: by hydrophilic and oleophilic type Nano-meter SiO_22Particle 1.0g disperse in deionized water, at
Water phase；5 ml ethyl acetate are poured at oily phase in same amount of polyoxypropyleneglycol, after then grease mixes, then plus cream
Agent Ben-zylphenol Polyoxyethyl Ether 1ml stirs 50min to get stable Pickering lotion is arrived；
(2) multi-walled carbon nanotube is pre-processed: ultrasonic oscillation mode is used, by the aggregate structure ordering of CNTs,
Then using the method for Fenton reagent modification, 5 h are reacted at room temperature, are filtered, and after water washing to neutrality, are placed in 100 DEG C of temperature
The lower dry 2h of degree, obtains hydroxylated CNTs, recycles high-speed shearing machine to carry out emulsification shearing, make hydroxylated CNTs length
10 ~ 30nm, finally plus coupling agent carries out grafting processing, and specific method is by silane coupling agent methyltrimethoxysilane and CNTs
Mixed with the ratio that weight ratio is 2: 1, then at 60 DEG C isothermal reaction 2h to get to the CNTs for connecting coupling agent；
(3) synthesis of phase-change microcapsule is completed in Pickering lotion using the method for in-situ polymerization: being filled
In the beaker of 200ml Pickering lotion, palmitinic acid 30.0g is added to make core material, added in the ratio of core material and wall material quality 5: 1
Melamine resin 6.0g makees wall material, and with heating water bath to 40 DEG C, adjusting solution pH value is 7.0, is stirred to react 40min, then plus pass through
Modified Nano-meter SiO_22After 2.0g, the reaction was continued 30min, and 10% acetic acid is added dropwise and adjusts acid until the pH value of solution is 5.0,
Dissolved adhesiveness gradually increases at this time, becomes opaque, is assembled and is formed cladding around core material, obtain being made of capsule-core and cyst wall
Phase-change microcapsule；
(4) synthesis of microcapsule phase-change fluid: after standing, the Pickering lotion of 155ml is added into beaker, adds
Phase-change microcapsule 48g, by pretreated multi-walled carbon nanotube 4.5g, then plus 285ml water, temperature be 48 DEG C when quickly stir
35min is mixed, addition polymerization ethylene oxide ether 0.40g is stirred evenly as drag reducer to get microcapsule phase-change fluid of the present invention.
Claims (5)
1. a kind of microcapsule phase-change fluid suitable for building heat supplying system, it is characterized in that by the raw material system of following weight percents
At: Pickering lotion 30 ~ 35%, phase-change microcapsule 8 ~ 10%, multi-walled carbon nanotube 0.8 ~ 1.0%, polyethylene glycol oxide ether 0.05 ~
0.10%, remaining is water；
The preparation method of microcapsule phase-change fluid suitable for building heat supplying system, comprising the following steps:
(1) Pickering lotion is prepared: by hydrophilic and oleophilic type Nano-meter SiO_22Particle disperses in deionized water, Cheng Shuixiang；By second
Acetoacetic ester is poured at oily phase in same amount of polyoxypropyleneglycol, after then grease mixes, then plus emulsifier, stirring, i.e.,
Obtain Pickering lotion；
(2) multi-walled carbon nanotube is pre-processed: the method modified using ultrasonic oscillation mode and Fenton reagent is obtained
Hydroxylated CNTs recycles high-speed shearing machine to carry out emulsification shearing, and finally plus coupling agent carries out grafting processing, obtains connecting idol
Join the CNTs of agent；
Using ultrasonic oscillation mode, by the aggregate structure ordering of CNTs, the method then modified using Fenton reagent,
5 h to be reacted at room temperature, are filtered, after water washing to neutrality, dry 2h, obtains hydroxylated CNTs at a temperature of being placed in 100 DEG C, then
Emulsification shearing is carried out using high-speed shearing machine, makes 10 ~ 30nm of hydroxylated CNTs length, finally plus coupling agent carries out at grafting
Reason, obtains the CNTs for connecting coupling agent；
(3) synthesis of phase-change microcapsule is completed in Pickering lotion using the method for in-situ polymerization: in Pickering cream
In liquid, palmitinic acid is added to make core material, melamine resin is added to make wall material, then plus Nano-meter SiO_2 modified2, quilt around core material after reaction
Assemble and formed cladding, obtains the phase-change microcapsule being made of capsule-core and cyst wall；
(4) in Pickering lotion, it is micro- the synthesis of microcapsule phase-change fluid: to sequentially add phase transformation obtained in abovementioned steps
Capsule, multi-walled carbon nanotube and water, polyethylene glycol oxide ether stir evenly to get the microcapsule phase-change fluid.
2. a kind of microcapsule phase-change fluid suitable for building heat supplying system according to claim 1, it is characterized in that
The preparation method of Pickering lotion: by hydrophilic and oleophilic type Nano-meter SiO_22Particle 1.0g disperses in deionized water, Cheng Shuixiang；
5 ml ethyl acetate are poured at oily phase in same amount of polyoxypropyleneglycol, after then grease mixes, then plus emulsifier
Ben-zylphenol Polyoxyethyl Ether 1ml stirs 50min to get stable Pickering lotion is arrived.
3. a kind of microcapsule phase-change fluid suitable for building heat supplying system according to claim 1 or 2, it is characterized in that adopting
The synthesis of phase-change microcapsule is completed in Pickering lotion with the method for in-situ polymerization: filling 200ml Pickering
In the beaker of lotion, palmitinic acid 30.0g is added to make core material, adds melamine resin 6.0g to make wall in the ratio of core material and wall material quality 5: 1
Material, with heating water bath to 40 DEG C, adjusting solution ph is 7.0, is stirred to react 40min, then plus Nano-meter SiO_2 modified2
After 2.0g, the reaction was continued 30min, and 10% acetic acid is added dropwise and adjusts acid until the pH value of solution is 5.0, at this time dissolved adhesiveness by
It is cumulative to add, become opaque, is assembled and formed cladding around core material, obtain the phase-change microcapsule being made of capsule-core and cyst wall.
4. a kind of microcapsule phase-change fluid suitable for building heat supplying system according to claim 1 or 2, it is characterized in that micro-
The synthesis of capsule phase transformation solution: after standing, the Pickering lotion of 150 ~ 165ml is added into beaker, adds phase-change microcapsule
40 ~ 50g, by pretreated 3.0 ~ 5.0g of multi-walled carbon nanotube, then plus 280 ~ 300ml water, temperature be 40 ~ 50 DEG C when it is fast
Speed stirs 30 ~ 45min, and 0.25 ~ 0.50 g of addition polymerization ethylene oxide ether is stirred evenly as drag reducer to get the microcapsules phase
Fluid.
5. a kind of microcapsule phase-change fluid suitable for building heat supplying system according to claim 4, it is characterized in that multi wall
When carbon nanotube is pre-processed, grafting processing method is by silane coupling agent methyltrimethoxysilane and CNTs with weight
Than the ratio mixing for 2: 1, then at 60 DEG C 2 ~ 4h of isothermal reaction to get to the CNTs for connecting coupling agent.
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| CN108611058A (en) * | 2018-04-20 | 2018-10-02 | 安徽工业大学 | A kind of Nano-meter SiO_22- GO modified synergic microcapsule phase-change energy storage materials |
| CN110961054B (en) * | 2019-11-27 | 2021-09-21 | 华南理工大学 | Composite phase-change microcapsule type fluid for high-voltage environment, preparation and application |
| CN113499742A (en) * | 2021-07-26 | 2021-10-15 | 太原工业学院 | Process for preparing palmitic acid/silicon dioxide phase change microcapsule material by adopting chemical precipitation method |
| CN115260997B (en) * | 2022-09-02 | 2024-05-03 | 陕西科技大学 | Nano ZnO@ZIF-8@SiO2Phase-change microcapsule and preparation method thereof |
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